/*
 * Copyright (C) 2019 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.drondea.sms.limiter;

import com.google.common.annotations.GwtIncompatible;

import java.time.Duration;

/**
 * This class is for {@code com.google.common.util.concurrent} use only!
 */
@GwtIncompatible // java.time.Duration
final class Internal {

    /**
     * Returns the number of nanoseconds of the given duration without throwing or overflowing.
     *
     * <p>Instead of throwing {@link ArithmeticException}, this method silently saturates to either
     * {@link Long#MAX_VALUE} or {@link Long#MIN_VALUE}. This behavior can be useful when decomposing
     * a duration in order to call a legacy API which requires a {@code long, TimeUnit} pair.
     */
    static long toNanosSaturated(Duration duration) {
        // Using a try/catch seems lazy, but the catch block will rarely get invoked (except for
        // durations longer than approximately +/- 292 years).
        try {
            return duration.toNanos();
        } catch (ArithmeticException tooBig) {
            return duration.isNegative() ? Long.MIN_VALUE : Long.MAX_VALUE;
        }
    }

    private Internal() {
    }
}
